CHAPTER 5
5-8 IEN HARDWARE REFERENCE 940043-002
Bus Extension
Ethernet or Token Ring bus extension is required when exceeding three chassis. Standard
bus extension may still be used. Groups of three chassis may be connected using Type B
cables and then connect the groups using Ethernet or Token Ring bus extension.
Note: Connecting more than three chassis using the standard bus extension may result in
deterioration of the standard bus clock and errors on the standard bus.
The Ethernet or Token Ring bus extension uses LET61B or LTR61B LAN port processors
respectively; however, these interfaces may not be used as router interfaces and must have
their own dedicated LAN for bus traffic. This method extends both the standard and high-
speed busses.
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Used when exceeding three chassis
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This method of bus extension is used to extend both the high-speed and the standard
bus
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The topology chosen should be dedicated as a backbone for the IEN node and not
shared with a LAN application
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Traffic across the extended bus is minimized to that which requires to be crossed to an
application interface in another chassis
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